Mechanical engineers speak a language that urban planners don’t understand, and biologists use language that’s probably meaningless to atmospheric scientists. Experts and most people in specialized fields develop their own unique verbal and written shorthand and use acronyms that are meaningless to the rest of us mere mortals. It’s very useful and professionally appropriate when they’re talking to each other, but really harmful when they’re trying to communicate and connect with us civilians. To regular people, your “shorthand” sounds like you’re intentionally talking down to them – again, it just feels arrogant to most people. And if you’re talking to people who are already skeptical or concerned with what you’re proposing, your unintelligible language just reinforces why they don’t trust you.